---
title: Custom Events
description: Learn how to yield custom events from your own tools.
---

### Complete Example

```python custom_events.py
import asyncio
from dataclasses import dataclass
from typing import Optional

from agno.agent import Agent
from agno.models.openai import OpenAIChat
from agno.run.agent import CustomEvent
from agno.tools import tool


# Our custom event, extending the CustomEvent class
@dataclass
class CustomerProfileEvent(CustomEvent):
    """CustomEvent for customer profile."""

    customer_name: Optional[str] = None
    customer_email: Optional[str] = None
    customer_phone: Optional[str] = None


# Our custom tool
@tool()
async def get_customer_profile():
    """
    Get customer profiles.
    """

    yield CustomerProfileEvent(
        customer_name="John Doe",
        customer_email="john.doe@example.com",
        customer_phone="1234567890",
    )


# Setup an Agent with our custom tool.
agent = Agent(
    model=OpenAIChat(id="gpt-4o"),
    tools=[get_customer_profile],
    instructions="Your task is to retrieve customer profiles for the user.",
)


async def run_agent():
    # Running the Agent: it should call our custom tool and yield the custom event
    async for event in agent.arun(
        "Hello, can you get me the customer profile for customer with ID 123?",
        stream=True,
    ):
        if isinstance(event, CustomEvent):
            print(f"✅ Custom event emitted: {event}")


asyncio.run(run_agent())
```

## Usage

<Steps>
  <Snippet file="create-venv-step.mdx" />

  <Step title="Install libraries">
    ```bash
    pip install -U agno openai
    ```
  </Step>

  <Step title="Export your OpenAI API key">

    <CodeGroup>

    ```bash Mac/Linux
      export OPENAI_API_KEY="your_openai_api_key_here"
    ```

    ```bash Windows
      $Env:OPENAI_API_KEY="your_openai_api_key_here"
    ```
    </CodeGroup> 
  </Step>

  <Step title="Create a Python file">
    Create a Python file and add the above code.
    ```bash
    touch custom_events.py
    ```
  </Step>

  <Step title="Run Agent">
    <CodeGroup>
    ```bash Mac
    python custom_events.py
    ```
    
    ```bash Windows
    python custom_events.py
    ```
    </CodeGroup>
  </Step>

  <Step title="Find All Cookbooks">
    Explore all the available cookbooks in the Agno repository. Click the link below to view the code on GitHub:

    <Link href="https://github.com/agno-agi/agno/tree/main/cookbook/agents/events" target="_blank">
      Agno Cookbooks on GitHub
    </Link>
  </Step>
</Steps>